mac80211: further cleanups to stopping BA sessions

Essentially consisting of passing the sta_info pointer around,
instead of repeatedly doing hash lookups.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/agg-rx.c

@@ -17,7 +17,7 @@
 #include <net/mac80211.h>
 #include "ieee80211_i.h"
 
-static void __ieee80211_sta_stop_rx_ba_session(struct sta_info *sta, u16 tid,
+void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
 				    u16 initiator, u16 reason)
 {
 	struct ieee80211_local *local = sta->local;
@@ -96,7 +96,7 @@ void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *r
 		return;
 	}
 
-	__ieee80211_sta_stop_rx_ba_session(sta, tid, initiator, reason);
+	__ieee80211_stop_rx_ba_session(sta, tid, initiator, reason);
 
 	rcu_read_unlock();
 }

net/mac80211/agg-tx.c

@@ -123,10 +123,10 @@ void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u1
 	ieee80211_tx_skb(sdata, skb, 0);
 }
 
-static int __ieee80211_stop_tx_ba_session(struct ieee80211_local *local,
-					  struct sta_info *sta, u16 tid,
+static int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
 					   enum ieee80211_back_parties initiator)
 {
+	struct ieee80211_local *local = sta->local;
 	int ret;
 	u8 *state;
 
@@ -165,7 +165,6 @@ static void sta_addba_resp_timer_expired(unsigned long data)
 	u16 tid = *(u8 *)data;
 	struct sta_info *sta = container_of((void *)data,
 		struct sta_info, timer_to_tid[tid]);
-	struct ieee80211_local *local = sta->local;
 	u8 *state;
 
 	state = &sta->ampdu_mlme.tid_state_tx[tid];
@@ -186,7 +185,7 @@ static void sta_addba_resp_timer_expired(unsigned long data)
 	printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
 #endif
 
-	__ieee80211_stop_tx_ba_session(local, sta, tid, WLAN_BACK_INITIATOR);
+	___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR);
 	spin_unlock_bh(&sta->lock);
 }
 
@@ -427,28 +426,11 @@ void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
 }
 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
 
-
-int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
-				 u8 *ra, u16 tid,
+int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
 				   enum ieee80211_back_parties initiator)
 {
-	struct ieee80211_local *local = hw_to_local(hw);
-	struct sta_info *sta;
 	u8 *state;
-	int ret = 0;
-
-	if (WARN_ON(!local->ops->ampdu_action))
-		return -EINVAL;
-
-	if (tid >= STA_TID_NUM)
-		return -EINVAL;
-
-	rcu_read_lock();
-	sta = sta_info_get(local, ra);
-	if (!sta) {
-		rcu_read_unlock();
-		return -ENOENT;
-	}
+	int ret;
 
 	/* check if the TID is in aggregation */
 	state = &sta->ampdu_mlme.tid_state_tx[tid];
@@ -461,16 +443,39 @@ int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
 
 #ifdef CONFIG_MAC80211_HT_DEBUG
 	printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n",
-	       ra, tid);
+	       sta->sta.addr, tid);
 #endif /* CONFIG_MAC80211_HT_DEBUG */
 
-	ret = __ieee80211_stop_tx_ba_session(local, sta, tid, initiator);
+	ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator);
 
  unlock:
 	spin_unlock_bh(&sta->lock);
+	return ret;
+}
+
+int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
+				 u8 *ra, u16 tid,
+				 enum ieee80211_back_parties initiator)
+{
+	struct ieee80211_local *local = hw_to_local(hw);
+	struct sta_info *sta;
+	int ret = 0;
+
+	if (WARN_ON(!local->ops->ampdu_action))
+		return -EINVAL;
 
+	if (tid >= STA_TID_NUM)
+		return -EINVAL;
+
+	rcu_read_lock();
+	sta = sta_info_get(local, ra);
+	if (!sta) {
 		rcu_read_unlock();
+		return -ENOENT;
+	}
 
+	ret = __ieee80211_stop_tx_ba_session(sta, tid, initiator);
+	rcu_read_unlock();
 	return ret;
 }
 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
@@ -623,11 +628,9 @@ void ieee80211_process_addba_resp(struct ieee80211_local *local,
 #ifdef CONFIG_MAC80211_HT_DEBUG
 		printk(KERN_DEBUG "Resuming TX aggregation for tid %d\n", tid);
 #endif /* CONFIG_MAC80211_HT_DEBUG */
-		spin_unlock_bh(&sta->lock);
 	} else {
 		sta->ampdu_mlme.addba_req_num[tid]++;
-		__ieee80211_stop_tx_ba_session(local, sta, tid,
-					       WLAN_BACK_INITIATOR);
-		spin_unlock_bh(&sta->lock);
+		___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR);
 	}
+	spin_unlock_bh(&sta->lock);
 }

net/mac80211/ht.c

@@ -155,14 +155,11 @@ u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 
 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta)
 {
-	struct ieee80211_local *local = sta->local;
 	int i;
 
 	for (i = 0; i <  STA_TID_NUM; i++) {
-		ieee80211_stop_tx_ba_session(&local->hw, sta->sta.addr, i,
-					     WLAN_BACK_INITIATOR);
-		ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr, i,
-						 WLAN_BACK_RECIPIENT,
+		__ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR);
+		__ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
 					       WLAN_REASON_QSTA_LEAVE_QBSS);
 	}
 }

net/mac80211/ieee80211_i.h

@@ -993,6 +993,8 @@ void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
 
 void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *da,
 				u16 tid, u16 initiator, u16 reason);
+void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
+				    u16 initiator, u16 reason);
 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta);
 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
 			     struct sta_info *sta,
@@ -1006,6 +1008,9 @@ void ieee80211_process_addba_request(struct ieee80211_local *local,
 				     struct ieee80211_mgmt *mgmt,
 				     size_t len);
 
+int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
+				   enum ieee80211_back_parties initiator);
+
 /* Spectrum management */
 void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata,
 				       struct ieee80211_mgmt *mgmt,